SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '70f088354f97f6fdde558ad7457c6505613ab15d44a342a67470499db3d725b7' 
  AND token = '/uqT+S6I9MP6HuwGhK8eLIa3OciYOM5XxHDqNVn39ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}